Users Guide

Table Of Contents
Wi-Fi Calling
Wi-Fi calling service allows cellular users to make or receive calls using a Wi-Fi network instead of using the
carrier’s cellular network. Wi-Fi calling allows users to place, receive calls, and text messages even when they are
beyond a cellular coverage but having a Wi-Fi network coverage. Major carriers around the world support Wi-Fi
calling service.
Wi-Fi Calling Support in ArubaOS
ArubaOS provides QoS for voice calls made using Wi-Fi calling. ArubaOS can identify and prioritize calls made
using Wi-Fi calling. UCM provides visibility for all voice calls made using Wi-Fi calling.
Wi-Fi Calling Operation
At a high level, this is how Wi-Fi calling operates:
1. Wi-Fi calling capable handset initiates a DNS query to locate the carrier’s evolved Packet Data Gateway
(ePDG).
2. The handset establishes a persistent IPsec tunnel with ePDG.
3. Calls, text, and traffic for other services offered by the carrier are then carried over this IPsec tunnel.
Some carriers use a standard FQDN format for ePDG that includes their Mobile Network Code (MNC) and
Mobile Country Code (MCC). For example, T-mobile uses ss.epdg.epc.mnc260.mcc310.pub.3gppnetwork.org.
Others follow a different standard format. For example, AT&T uses epdg.epc.att.net.
Wi-Fi Calling Configuration
The Wi-Fi Calling ALG can be using the controller WebUI or CLI. The ALG is enabled by default.
In the WebUI
The following procedure configures the Wi-Fi Calling ALG using the WebUI.
1. Navigate to Configuration >Advanced Services > All Profiles.
2. Expand Other Profiles and click WiFi Calling Configuration.
3. In the Profile Details section, configure the settings described in Table 226.
4. Click Save.
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